[rules-users] ClassCastException using memberOf operator

[Wolfgang Laun]

The simple
  i: Item ( f memberOf (makeA()) )
should do.
-W

On 23/01/2013, Marco Malziotti <marco.malziotti at trs.it> wrote:
> Hello
> I am a beginner in Drools 5.1.1 and try to use 'memberOf' operator.
> Simply I want check whether a short field 'f' (belonging to Item class)
> is a member of an array 'a': retrieved by a function 'makeA'.
> In my .drl file I try with :
>
> function Short[] makeA() {
>    return  (new Short[] {1, 2, 3} );
> }
>
> rule "chek"
> when
>    a: Short[]() from makeA()
>    i: Item ( f memberOf a )
> then
> ... 'f' is member of array 'a' !
> end
>
> I have following stack trace:
> java.lang.ClassCastException: Can't check if an attribute is member of
> an object of class class java.lang.Short
> at
> org.drools.base.evaluators.SetEvaluatorsDefinition$BaseMemberOfEvaluator.evaluateCachedRight(SetEvaluatorsDefinition.java:532)
> at
> org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117)
> at
> org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121)
> at
> org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151)
> at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125)
> at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190)
> at
> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
> at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
> at
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
>
> In :
> http://lists.jboss.org/pipermail/rules-users/2008-October/006746.html
> and
> http://lists.jboss.org/pipermail/rules-users/2007-September/003010.html
> I haven't found the solution to my problem.
>
> I don't know if it is already open a related issue.
>
> Thanks for your attention.
> Regards.
>
> Marco Malziotti
> Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A.
> Integration Test Engineer
> Tel.  + 39 06.87281.407
> Fax.  + 39 06.87281.550
> E-mail: marco.malziotti at trs.it
>
>
> Tecnologie nelle Reti e nei Sistemi T.R.S. SpA
> Via della Bufalotta, 378 - 00139 Roma
> Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550
>
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